libstdc++
string_conversions.h
1 // String Conversions -*- C++ -*-
2 
3 // Copyright (C) 2008, 2009 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
10 
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
15 
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
19 
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
24 
25 #ifndef _STRING_CONVERSIONS_H
26 #define _STRING_CONVERSIONS_H 1
27 
28 #pragma GCC system_header
29 
30 #include <ext/numeric_traits.h>
31 #include <bits/functexcept.h>
32 #include <cstddef>
33 #include <cstdlib>
34 #include <cwchar>
35 #include <cstdio>
36 #include <cerrno>
37 
38 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
39 
40  // Helper for all the sto* functions.
41  template<typename _TRet, typename _Ret = _TRet, typename _CharT,
42  typename... _Base>
43  _Ret
44  __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
45  const char* __name, const _CharT* __str, std::size_t* __idx,
46  _Base... __base)
47  {
48  _Ret __ret;
49 
50  _CharT* __endptr;
51  errno = 0;
52  const _TRet __tmp = __convf(__str, &__endptr, __base...);
53 
54  if (__endptr == __str)
55  std::__throw_invalid_argument(__name);
56  else if (errno == ERANGE
57  || (std::__are_same<_Ret, int>::__value
58  && (__tmp < __numeric_traits<int>::__min
59  || __tmp > __numeric_traits<int>::__max)))
60  std::__throw_out_of_range(__name);
61  else
62  __ret = __tmp;
63 
64  if (__idx)
65  *__idx = __endptr - __str;
66 
67  return __ret;
68  }
69 
70  // Helper for the to_string / to_wstring functions.
71  template<typename _String, typename _CharT = typename _String::value_type>
72  _String
73  __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
74  __builtin_va_list), std::size_t __n,
75  const _CharT* __fmt, ...)
76  {
77  // XXX Eventually the result will be constructed in place in
78  // the C++0x string, likely with the help of internal hooks.
79  _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
80  * __n));
81 
82  __builtin_va_list __args;
83  __builtin_va_start(__args, __fmt);
84 
85  const int __len = __convf(__s, __n, __fmt, __args);
86 
87  __builtin_va_end(__args);
88 
89  return _String(__s, __s + __len);
90  }
91 
92 _GLIBCXX_END_NAMESPACE
93 
94 #endif // _STRING_CONVERSIONS_H
ISO C++ entities toplevel namespace is std.
GNU extensions for public use.